Magnetic Field Minimum for Non-Magnetic Particle Separation
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Solution Overview
Problem
Current methods for manipulating non-magnetic particles in microfluidic channels are limited by speed, efficiency, and cost, making it difficult to effectively separate these particles from magnetic particles, such as in the isolation of circulating tumor cells or non-magnetic precipitants from magnetic fluids.
Innovation Solution
The use of a magnetic field applied to a microfluidic channel with a magnetic field minimum positioned along the center axis, causing non-magnetic particles to be transported towards the center axis while magnetic particles are transported towards the channel walls, allowing for separation and enrichment of non-magnetic particles in a specific region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods are used to manipulate non-magnetic particles in microfluidic channels, then the manipulation can be performed, but the speed, efficiency, and cost are limited
Solution Approach 1:
The patent replaces conventional mechanical manipulation methods with magnetic field-based manipulation. Magnetic fields are applied to the microfluidic channel to manipulate both magnetic and non-magnetic particles simultaneously, achieving faster and more efficient particle manipulation without complex mechanical structures. This substitution of mechanical systems with magnetic field systems directly addresses the contradiction by improving productivity while avoiding increased device complexity.
Solution Approach 2:
The patent utilizes changes in magnetic field parameters (strength, gradient, direction) to manipulate particle behavior in the microfluidic channel. By adjusting magnetic field parameters, the system achieves efficient and rapid manipulation of particles without requiring complex mechanical adjustments or additional components, thereby improving productivity without proportionally increasing device complexity.
2Manufacturing precision
If non-magnetic particles are separated from magnetic particles, then the separation can be achieved, but the concentration of non-magnetic particles in a small volume is difficult to achieve
Solution Approach 1:
The patent uses magnetic field forces to simultaneously separate and concentrate non-magnetic particles in a single operation. The magnetic field manipulates particle distribution within the fluid, achieving both high separation efficiency and high concentration of non-magnetic particles in a small volume region, resolving the contradiction between separation precision and particle concentration.
Solution Approach 2:
The patent combines separation and concentration functions into a single magnetic field manipulation process. By applying magnetic fields to the microfluidic channel, the system performs both separation of non-magnetic particles from magnetic particles and concentration of non-magnetic particles into a small volume simultaneously, achieving both high separation efficiency and high particle concentration without requiring multiple sequential steps.
3Speed
If magnetic fields are applied to manipulate particles, then manipulation speed improves, but the cost and complexity of the system increases
Solution Approach 1:
The patent replaces slow mechanical manipulation methods with magnetic field-based manipulation, achieving rapid particle manipulation. The magnetic field system, while requiring magnets and power supplies, eliminates the need for complex mechanical actuation systems, pumps, and valves, thereby improving speed without proportionally increasing overall system complexity.
Solution Approach 2:
The magnetic field system performs multiple functions simultaneously: manipulating magnetic particles, manipulating non-magnetic particles, separating different particle types, and concentrating particles. This multi-functionality reduces the need for separate systems for each function, thereby improving manipulation speed without proportionally increasing system complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enables efficient separation of non-magnetic particles from magnetic particles, achieving a high concentration of non-magnetic particles in a small volume, facilitating applications like continuous sorting of cells and targeted cell removal from blood streams.
Implementation Method 1
applying a magnetic field to a microfluidic channel with a magnetic field minimum positioned along the center axis, causing non-magnetic particles to be transported towards the center axis while magnetic particles are transported towards the channel walls
Implementation Method 2
a magnetic field applied to a microfluidic channel with a magnetic field minimum positioned along the center axis, causing non-magnetic particles to be transported towards the center axis
Data Source
AI summary
Systems and methods for the manipulation of particles within channels such as microfluidic channels are provided. In one set of embodiments, magnets are positioned around a channel. As a fluid containing magnetic and non-magnetic particles flows through the channel, the magnetic field created by the magnets can be used to transport the magnetic and/or non-magnetic particles to desired locations within the channel, which may useful in some cases for causing some separation of the particles. For example, the magnetic field may be used to transport magnetic or non-magnetic particles from a core fluid to a surrounding sheath fluid. In some cases, the magnetic field is used to transport non-magnetic particles to a small volume within the channel (e.g., a single-file row within the channel). The systems and methods described herein may find application in a variety of fields including, for example, continuous sorting of cells, removal of targeted cells from a stream of blood, or the arrangement of non-magnetic particles in channels for analysis.